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Lateralization visual field

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https://www.readbyqxmd.com/read/29791914/atlas-independent-electrophysiological-mapping-of-the-optimal-locus-of-subthalamic-deep-brain-stimulation-for-the-motor-symptoms-of-parkinson-disease
#1
Erin C Conrad, James M Mossner, Kelvin L Chou, Parag G Patil
BACKGROUND/AIMS: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) improves motor symptoms of Parkinson disease (PD). However, motor outcomes can be variable, perhaps due to inconsistent positioning of the active contact relative to an unknown optimal locus of stimulation. Here, we determine the optimal locus of STN stimulation in a geometrically unconstrained, mathematically precise, and atlas-independent manner, using Unified Parkinson Disease Rating Scale (UPDRS) motor outcomes and an electrophysiological neuronal stimulation model...
May 23, 2018: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/29790469/intraventricular-ganglioglioma-presenting-with-spontaneous-hemorrhage
#2
Alexandre Rainha Campos, Luisa Biscoito, Maria Gabriela Gasparinho
Intraventricular gangliogliomas presenting with spontaneous hemorrhage are rare. Due to high density of important tracts lateral to the ventricular atrium, the intraparietal trans sulcal approach is a good option to remove lesions in this location. These tracts are displaced and sometimes destroyed by the presence of large masses. A 33-year-old male presented with a sudden headache and a generalized seizure. He had a left visual field hemianopia and left visual field neglect. Brain computer tomography and magnetic resonance imaging revealed a hemorrhagic tumor located in his right atrium...
March 29, 2018: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/29780438/magnetic-domain-patterns-in-bilayered-ribbons-studied-by-magnetic-force-microscopy-and-magneto-optical-kerr-microscopy
#3
Jana Trojková, Ondřej Životský, Aleš Hendrych, Dmitry Markov, Klára Drobíková
The magnetic domain patterns of amorphous bilayered FeSiB/FeNbSiB and FeNbCuSiB/CoSiB ribbons are observed and analysed using the magneto-optical Kerr microscopy (MOKM) and magnetic force microscopy (MFM). Both microscopic techniques are highly sensitive to the sample surface; possibility of Kerr microscopy to visualize the domains separately in both layers is achieved by focusing the laser spot on the ribbon cross section. Wide curved domains as well as fine fingerprint domains were detected at the surface of ribbons due to presence of local stresses coming from the preparation process...
2018: Scanning
https://www.readbyqxmd.com/read/29775858/when-is-the-right-hemisphere-holistic-and-when-is-it-not-the-case-of-chinese-character-recognition
#4
Harry K S Chung, Jacklyn C Y Leung, Vienne M Y Wong, Janet H Hsiao
Holistic processing (HP) has long been considered a characteristic of right hemisphere (RH) processing. Indeed, holistic face processing is typically associated with left visual field (LVF)/RH processing advantages. Nevertheless, expert Chinese character recognition involves reduced HP and increased RH lateralization, presenting a counterexample. Recent modeling research suggests that RH processing may be associated with an increase or decrease in HP, depending on whether spacing or component information was used respectively...
May 15, 2018: Cognition
https://www.readbyqxmd.com/read/29773438/the-relationship-of-subepidermal-moisture-and-early-stage-pressure-injury-by-visual-skin-assessment
#5
Chul-Gyu Kim, Seungmi Park, Ji Woon Ko, Sungho Jo
AIM: The purpose of this study was to examine the relationship of subepidermal moisture and early stage pressure injury by visual skin assessment in elderly Korean. METHODS: Twenty-nine elderly participated at a particular nursing home. Data were collected for 12 weeks by one wound care nurse. Visual skin assessment and subepidermal moisture value were measured at both buttocks, both ischia, both trochanters, sacrum, and coccyx of each subject once a week. RESULTS: Subepidermal moisture value of stage 1 pressure injury was significantly higher than that of no injury and blanching erythema...
May 8, 2018: Journal of Tissue Viability
https://www.readbyqxmd.com/read/29771545/hemispheric-asymmetries-in-categorical-facial-expression-perception
#6
D Michael Burt, Markus Hausmann
Although many sensory phenomena vary continuously, humans tend to divide them into discrete categories with facial expressions being divided into categories such as happy, sad, anger, and fear. A critical effect of category use is categorical perception: same sized physical differences are better perceived if the difference occurs between two categories rather than within the same category. Here we investigate the lateralization of categorical perception of facial expressions. Categorical perception of facial expressions may be lateralized to the right hemisphere due to the intimacy of basic, possibly universal and innate, prototypical facial expression categories and face processing which is predominantly lateralized to the right hemisphere...
May 17, 2018: Emotion
https://www.readbyqxmd.com/read/29771362/rates-of-cerebral-protein-synthesis-in-primary-visual-cortex-during-sleep-dependent-memory-consolidation-a-study-in-human-subjects
#7
Dante Picchioni, Kathleen C Schmidt, Kelly K McWhirter, Inna Loutaev, Adriana J Pavletic, Andrew M Speer, Alan J Zametkin, Ning Miao, Shrinivas Bishu, Kate M Turetsky, Anne S Morrow, Jeffrey L Nadel, Brittney C Evans, Diana M Vesselinovitch, Carrie A Sheeler, Thomas J Balkin, Carolyn B Smith
If protein synthesis during sleep is required for sleep-dependent memory consolidation, we might expect rates of cerebral protein synthesis (rCPS) to increase during sleep in the local brain circuits that support performance on a particular task following training on that task. To measure circuit-specific brain protein synthesis during a daytime nap opportunity, we used the L-[1-(11)C]leucine positron emission tomography (PET) method with simultaneous polysomnography. We trained subjects on the visual texture discrimination task (TDT)...
May 15, 2018: Sleep
https://www.readbyqxmd.com/read/29766762/typical-visual-field-locations-enhance-processing-in-object-selective-channels-of-human-occipital-cortex
#8
Daniel Kaiser, Radoslaw M Cichy
Natural environments consist of multiple objects, many of which repeatedly occupy similar locations within a scene. For example, hats are seen on people's heads, while shoes are most often seen close to the ground. Such positional regularities bias the distribution of objects across the visual field: Hats are more often encountered in the upper visual field, while shoes are more often encountered in the lower visual field. Here we test the hypothesis that typical visual-field locations of objects facilitate cortical processing...
May 16, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29758253/responsive-neural-activities-in-the-primary-visual-cortex-of-retinal-degenerated-rats
#9
Yi Wang, Ke Chen, Leanne Lai Hang Chan
To study the responsive neural activities in the primary visual cortex (V1) of retinal degeneration (RD) models, experiments involving the wild type (WT) and RD rats were conducted. The neural responses in the V1 were recorded extracellularly, while a visual stimulus with varied light intensity was given to the subjects. First, the firing rate and its relationship with light intensity were compared between the WT and RD groups. Second, the mutual information (MI) between the visual stimulus and neural response was determined for every isolated unit to quantify the amount and efficiency of information transmission in the V1 for both the control and experimental groups...
May 11, 2018: Neuroscience
https://www.readbyqxmd.com/read/29756509/hemispheric-asymmetry-in-holistic-processing-of-words
#10
Paulo Ventura, João Delgado, Miguel Ferreira, António Farinha-Fernandes, José C Guerreiro, Bruno Faustino, Isabel Leite, Alan C-N Wong
Holistic processing has been regarded as a hallmark of face perception, indicating the automatic and obligatory tendency of the visual system to process all face parts as a perceptual unit rather than in isolation. Studies involving lateralized stimulus presentation suggest that the right hemisphere dominates holistic face processing. Holistic processing can also be shown with other categories such as words and thus it is not specific to faces or face-like expertize. Here, we used divided visual field presentation to investigate the possibly different contributions of the two hemispheres for holistic word processing...
May 13, 2018: Laterality
https://www.readbyqxmd.com/read/29753575/quantitative-apparent-diffusion-coefficient-mapping-may-predict-seizure-onset-in-children-with-sturge-weber-syndrome
#11
Anna L R Pinto, Yangming Ou, Mustafa Sahin, P Ellen Grant
BACKGROUND: Sturge-Weber syndrome (SWS) is often accompanied by seizures, stroke-like episodes, hemiparesis, and visual field deficits. This study aimed to identify early pathophysiologic changes that exist before the development of clinical symptoms and to evaluate if the apparent diffusion coefficient (ADC) map is a candidate early biomarker of seizure risk in patients with SWS. METHODS: This is a prospective cross-sectional study using quantitative ADC analysis to predict onset of epilepsy...
April 12, 2018: Pediatric Neurology
https://www.readbyqxmd.com/read/29753019/psychophysical-and-neuroimaging-responses-to-moving-stimuli-in-a-patient-with-the-riddoch-phenomenon-due-to-bilateral-visual-cortex-lesions
#12
Michael J Arcaro, Lore Thaler, Derek J Quinlan, Simona Monaco, Sarah Khan, Kenneth F Valyear, Rainer Goebel, Gordon N Dutton, Melvyn A Goodale, Sabine Kastner, Jody C Culham
Patients with injury to early visual cortex or its inputs can display the Riddoch phenomenon: preserved awareness for moving but not stationary stimuli. We provide a detailed case report of a patient with the Riddoch phenomenon, MC. MC has extensive bilateral lesions to occipitotemporal cortex that include most early visual cortex and complete blindness in visual field perimetry testing with static targets. Nevertheless, she shows a remarkably robust preserved ability to perceive motion, enabling her to navigate through cluttered environments and perform actions like catching moving balls...
May 9, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29733316/experimental-investigation-of-the-flow-structure-over-a-delta-wing-via-flow-visualization-methods
#13
Lu Shen, Zong-Nan Chen, Chihyung Wen
It is well known that the flow field over a delta wing is dominated by a pair of counter rotating leading edge vortices (LEV). However, their mechanism is not well understood. The flow visualization technique is a promising non-intrusive method to illustrate the complex flow field spatially and temporally. A basic flow visualization setup consists of a high-powered laser and optic lenses to generate the laser sheet, a camera, a tracer particle generator, and a data processor. The wind tunnel setup, the specifications of devices involved, and the corresponding parameter settings are dependent on the flow features to be obtained...
April 23, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29725310/craving-responses-to-methamphetamine-and-sexual-visual-cues-in-individuals-with-methamphetamine-use-disorder-after-long-term-drug-rehabilitation
#14
Shucai Huang, Zhixue Zhang, Yuanyuan Dai, Changcun Zhang, Cheng Yang, Lidan Fan, Jun Liu, Wei Hao, Hongxian Chen
Studies utilizing functional magnetic resonance imaging (fMRI) cue-reactivity paradigms have demonstrated that short-term abstinent or current methamphetamine (MA) users have increased brain activity in the ventral striatum, caudate nucleus and medial frontal cortex, when exposed to MA-related visual cues. However, patterns of brain activity following cue-reactivity in subjects with long-term MA abstinence, especially long-term compulsory drug rehabilitation, have not been well studied. To enrich knowledge in this field, functional brain imaging was conducted during a cue-reactivity paradigm task in 28 individuals with MA use disorder following long-term compulsory drug rehabilitation, and 27 healthy control subjects...
2018: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29721455/full-field-in-vitro-investigation-of-hard-and-soft-tissue-strain-in-the-spine-by-means-of-digital-image-correlation
#15
REVIEW
Maria Luisa Ruspi, Marco Palanca, Cesare Faldini, Luca Cristofolini
Introduction: The spine deserves careful biomechanical investigation, because of the different types of degeneration deriving from daily stress, trauma, and hard and soft tissue pathologies. Many biomechanical studies evaluated the range of motion, structural stiffness of spine segments under different loading conditions, without addressing the strain distribution. Strain gauges have been used to measure strain in the vertebral body, in a pointwise way.What is currently missing is a method to measure the distribution of strain in the soft tissues (intervertebral discs and ligaments), and an integration between measurements in the hard and soft tissues...
October 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29718332/endoscopic-endonasal-transmaxillary-transshpenoidal-approach-for-excision-of-a-superior-orbital-fissure-cavernous-sinus-meningioma-2-dimensional-operative-video
#16
Ehab El Refaee, Steffen Fleck, Marc Matthes, Henry W S Schroeder
We present a 43-old-male who suffered from a slowly progressive loss of vision in the left eye. Magnetic resonance (MR) imaging revealed a well-circumscribed contrast-enhancing lesion in the region of the anterior cavernous sinus and superior orbital fissure that extended into the optic canal. A schwannoma or meningioma was suspected. A transcranial surgery performed at another institution was not successful in removing the tumor and further deterioration of vision occurred. After resection of the left middle turbinate, the sphenoid and maxillary sinus were opened...
April 28, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29713267/callosal-influence-on-visual-receptive-fields-has-an-ocular-an-orientation-and-direction-bias
#17
Sergio A Conde-Ocazionez, Christiane Jungen, Thomas Wunderle, David Eriksson, Sergio Neuenschwander, Kerstin E Schmidt
One leading hypothesis on the nature of visual callosal connections (CC) is that they replicate features of intrahemispheric lateral connections. However, CC act also in the central part of the binocular visual field. In agreement, early experiments in cats indicated that they provide the ipsilateral eye part of binocular receptive fields (RFs) at the vertical midline (Berlucchi and Rizzolatti, 1968), and play a key role in stereoscopic function. But until today callosal inputs to receptive fields activated by one or both eyes were never compared simultaneously, because callosal function has been often studied by cutting or lesioning either corpus callosum or optic chiasm not allowing such a comparison...
2018: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/29710368/optimized-screw-trajectory-for-lumbar-cortical-bone-trajectory-pedicle-screws-based-on-clinical-outcome-evidence-favoring-the-buttress-effect-theory
#18
Shunji Asamoto, Kota Kojima, Michael Winking, Andreas Jödicke, Masayuki Ishikawa, Shinichi Ishihara, Wolfgang Deinsberger, Jun Muto, Makoto Nishiyama
BACKGROUND:  Cortical bone trajectory (CBT) is a relatively new technique for pedicle screw insertion in the field of spine surgery. Previous studies have demonstrated the significantly better pullout and toggle characteristics the new method offers, and it appears to have certain advantages over the widely used traditional trajectory. The mechanism of the pullout and toggle characteristics still remains unknown. PURPOSE:  To report the medium- to long-term follow-up findings of patients who underwent posterior lumbar interbody fusion or posterior lumbar fusion (PLIF/PLF) at our institution and to discuss the ideal screw trajectory when using this technique...
April 30, 2018: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/29705618/change-in-drawing-placement-a-measure-of-change-in-mood-state-reflective-of-hemispheric-lateralization-of-emotion
#19
Tracy R Butler, Erin M O'Mara, Josephine F Wilson
The Valence Hypothesis of cerebral lateralization of emotion suggests greater right hemisphere activation during negative mood and greater left hemisphere activation during positive mood. This can manifest as visual field attentional bias. Here, study participants completed an assessment of current mood state (PANAS) and made a drawing (Drawing 1). To induce positive or negative mood, participants played a game; then, the winner read a script depicting a positive interpersonal interaction and the loser read a script depicting a negative interpersonal interaction...
April 26, 2018: Brain and Cognition
https://www.readbyqxmd.com/read/29701373/uniportal-vats-lobectomy-subxiphoid-approach
#20
Catarina Carvalheiro, Javier Gallego-Poveda, Diego Gonzalez-Rivas, Jorge Cruz
INTRODUCTION: Interest in uniportal video-assisted thoracic surgery (VATS) is rapidly growing worldwide because it represents the surgical approach to the lung with the least possible trauma and in recent years the subxiphoid approach has been used in the field of thoracic surgery as it is associated with lesser pain because there is no intercostal nerve damage and it provides excellent cosmetic outcomes. This technique was recently introduced for major pulmonary resections and even bilateral approaches in selected patients...
July 2017: Revista Portuguesa de Cirurgia Cardio-torácica e Vascular
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